I wasn't happy with the hat as knitted up from the pattern (left), so I devised my own version (right).Instead of knitting and casting off rim reinforcement, I started with a few rows of garter stitch that could be folded over (and conveniently over a ring of pipecleaners). I also made the underside of the brim - the outside of the flaps - the knit side and swapped over for the crown of the hat. I used a non-slanting decrease, the raised stitches of which are a feature (and help in the folding of the tricorn). I also used pipecleaners to strengthen the base of the crown.

The pipecleaners give the hat some rigidity and shapeability.There are 6 ridged decreases through the brim and 3 in the crown. The full pattern is below the next progress picture of Samuel.Next to start on the accessories.All cast on and ready to go.

Break yarn and thread through remaining stitches.To make up:Sew up seam, keeping in mind the knit side is the right side.Sew in pipecleaner ring at base of crown.Turn garter stitch edge over and sew in pipecleaner ring.Mould hat.